<template>
    <div class="login_container">
        <div class="login_box">
            <!-- 头像区域 -->
            <div class="avatar_box">
                <img src="../assets/logo.png" alt=""/>
            </div>
            <!-- 表单区域 -->
           <el-form ref="loginFormRef" :model="loginForm" :rules="rulesLogin" label-width="0px" class="login_form">
               <!-- 用户名 -->
               <el-form-item prop="username">
                   <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
               </el-form-item>
               <!-- 密码 -->
               <el-form-item prop="password">
                   <el-input v-model="loginForm.password" prefix-icon="iconfont icon-lock" type="password"></el-input>
               </el-form-item>
               <!-- 按钮区域 -->
               <el-form-item class="btn">
                   <el-button type="primary" @click="login">登录</el-button>
                   <el-button type="info" @click="resetLogin">重置</el-button>
               </el-form-item>
           </el-form>
        </div>
    </div>
</template>

<script>
export default {
    data(){
        return {
            rules:'',
            // 这是登录表单数据绑定对象
            loginForm:{
                username:'',
                password:''
            },
            // 这是表单验证规则
            rulesLogin:{
                // 验证用户名是否合法
                username:[
                    {required:true,message:"请输入登录名称",trigger:"blur"},
                    {min:3,max:10,message:"长度在3到10个字符",trigger:"blur"}
                ],
                password:[
                     {required:true,message:"请输入登录密码",trigger:"blur"},
                    {min:6,max:16,message:"长度在6到16个字符",trigger:"blur"}

                ]
            }
        }
    },
    methods:{
        // 点击重置按钮
        resetLogin(){
           this.$refs.loginFormRef.resetFields();
        },
        // 表单登录前预验证
        login(){
            this.$refs.loginFormRef.validate(async (valid) =>{
                if(!valid) return;
                const {data:res}=await this.$http.post('login',this.loginForm);
                // 判断状态码
                if(res.meta.status!==200) return this.$message.error('登录失败');
                this.$message.success('登录成功')
                // 1.将登录成功后的token，保存到客户端的sessionStorage中
                // 项目中除了登录之外的其他api接口，必须在登录之后才能访问
                // token只应当在网站打开期间生效，所以将token保存在sessionStorage中
                window.sessionStorage.setItem("token",res.data.token)
                // 2.通过编程式导航跳转到后台主页，路由是/home
                this.$router.push('/home');
            });
        }
    }
}
</script>

<style lang="less" scoped>
.login_container{
    background-color:#c7e2fd;
    height:100%;
}
.login_box{
    width:450px;
    height:300px;
    background-color:#fff;
    border-radius:3px;
    position:absolute;
    left:50%;
    top:50%;
    transform:translate(-50%,-50%);
}
.avatar_box{
    height:130px;
    width:130px;
    border:1px solid #eee;
    border-radius:50%;
    padding:10px;
    box-shadow:0 0 10px #ddd;
    position:absolute;
    left:50%;
    transform:translate(-50%,-50%);
    background-color:#eee;
    img{
        width:100%;
        height:100%;
        border-radius:50%;
        background-color:#eee;
    }
}
.login_form{
    position:absolute;
    bottom:0;
    width:100%;
    padding:0 20px;
    box-sizing:border-box;
}
.btn{
    display:flex;
    justify-content:flex-end;
}
</style>
